发明名称 |
Method and apparatus of low current startup circuit for switching mode power supplies |
摘要 |
A startup circuit for a switching-mode power supply (SMPS) includes a first voltage detector configured to trigger the switching-mode power supply from a first operation mode to a second operation mode when an input supply voltage exceeds a first threshold voltage, a current consumption in the first voltage detector in the first operation mode being determined by a reverse leakage current of a diode. A feedback circuit is coupled to the first voltage detector and being capable of maintaining a positive feedback loop. A second voltage detector is coupled to the first voltage detector and the feedback circuit, and is configured to trigger the switching-mode power supply to switch from the second operation mode to the first operation mode when the input supply voltage is below a second threshold voltage.
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申请公布号 |
US8559200(B2) |
申请公布日期 |
2013.10.15 |
申请号 |
US201113015493 |
申请日期 |
2011.01.27 |
申请人 |
ZONG QIANG;FANG SHAOHUA;FEI REIXIA;XIE JIA;BCD SEMICONDUCTOR MANUFACTURING LIMITED |
发明人 |
ZONG QIANG;FANG SHAOHUA;FEI REIXIA;XIE JIA |
分类号 |
H02M1/00;H02M3/335 |
主分类号 |
H02M1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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